Expansion anchor spring biased apart at entering end



Jan. 26, 1954 w. .1. LEWIS 2,667,099

EXPANSION ANCHOR SPRING BIASED APART AT ENTERING END Filed Dec. 19, 1950 v I I F; A I.

1 1 L W j m 20 WW" $19 MUT W WWII 1 Fig.1 FIG/ 2 FIG- 4 IN V EN TOR.

F1 7 E VABREN JLEWIS FIG. 6 %NEY at J.

Patented Jan. 26, 1954 EXPANSION ANCHOR SPRING BIAS'ED APART AT ENTERING END Warren J. Lewis,.Mansfield,. Ohio, assignor to. The; Ohio- Brass Company, Mansfield,v -hio,, a: cor poration of New Jersey Application December 19, 1950, SerialNl). 201,651-

7 Claims. (0]. 852.4) l 2:-

This invention relates Dansion boltsand; in halves and. limit rotation. of? the: expander rel'aiparticular to bolts intended and adapted to. suptive to the shell when the stud H3 is rotated, ,if port the roofs of mines thus. eliminating the. use such cooperation is necessary. of costly and interfering supporting beams and The shell halves: orrsections: 2: and 3' are; each postsfurther slotted longitudinally as at, 12: but these The. object of this invention is to provide a slotsdo not extendfor: the full lengthof theshell self-contained expansion bolt which may be inbutsuflici'ently to providethe shell with. four: ex:- serted into a drilled opening in amine roof: and pandable members and the. lower portion of the have both ends properly located relative thereshell is intact except. for a shallow longitudinal to and having an initially spread but yieldable groove I3 partway through thezshellhalves toreshell which may be collapsed to engage the. side ceive the freeends; M otaz-springyokerlfi; wall of the drilled opening. with sufiicient pres- The yoke I is: assembledwith theshell-halves sure. to prevent the. rotation. of the shell relative 2' and; 3 by positioning the. same: in: the: slots- [2 to the wallof theopening when the stud is rotated with. the bight at the closed end; projecting from tomove the expander so. as to. increase'the' presthe free. end. of the shell, andthe. free, ends. I34. of sure of the shell againstthe whole wall sufiici'ent the yoke are positioned in. the grooves.- B; at the to: anchor the shell. to: the mine roof at a point well lower: ends of the shell; sections. Theiends; 1.4. arespaced from the surface of. the roof; secured in the grooves [3 by peaning; over" the This. invention will be. better understood. from edges of the roov 3 n o theyoke ends; This the specification. which follows and reference to 99 attachment maybe. made byfusionbetween the the-drawingin which. parts. but the heat; is very" apt. to; destroy the Fig. l is a side view of the bolt. prior to posite per'fli the metal'vin theyokeiendsi tioning in amine roof. In. order to press the lower ends; of: the shell Fig. 2 is a side. view ofthe boltat'so' degree' rotahalves. together and. yieldingly' maintain. them totion from Fig. 1. in gether, thesidearms' l6 of theyoke l5iare' formedi Fig. 3 is a, top end viewof' Figs. 1 and z'before non-parallel which brings the; free ends I14 closer insertionin-a hole in aminearoot. together than at the closed end: ofv the: yoke; be-

Fig. 4. represents the bolt as; iti d in fore.theyokeisassembledwithztheshellisections; holein amine roofiprior to the expansion of the The. normal. spacing, between the: ends IA. of: the: shell. by the expander;v the hole: being drilled 3i yoke. is less. than: the diameter. of the shell slightly larger than the. fully collapsed diameter at its We! hinged of the shell. The larger end of the expander is grooved. on

Fig 5-1 sectionaljview. on ;5 opposite sides: to receive the yoke:- arms l6. and

Figs. 6 and? are two side: views. respectively 0f the: closed. end. of thearms: lfisis conn'eotedfbythe' a. springmember which functions in several ways bight' ar ed 0 be: e gagediby' Expander as later explained. when in its. extreme upper position. or by the end This invention. comprises a longitudinall'y'split oithe'istud-r 11 11 t haves 2 and 3. which are u' The stud" it is threaded. at one. end to enter hinged together at 4 which also holds the he threaded; opening l8 in. the expander" and theagainst. relative longitudinal movement t lower end of. the. stud is provided with a head I9 The inner surface. 5' of ach n is t fo and washer 20'. The lower end. of thestudmay'be nsi r 1 t although they may be threaded for a nut in place of the integral head. straight; The lower ends of the yoke are secured in fixed Positioned i th free or expandabl 1' of relation to their respective shell halves and. act the shell is a tapered expander I provided with a spring in spring type hinge; that When oppositely disposed guide wings. 8; The expander the upper ends of the-shell halvesarepressedinis provided. with a through' axial-threaded open- -r the Position shown in a. fu ther ing 9 to receive th t n tension is set: up. in the arms due to their being Theshell lisso constructed thata longitudinal" secured in fixed relation at both ends d this? slot ll is provided between thesedges of the halves function the same a5 p in a spring on a 2 and 3 for substantially the length of the shell, g type of hing When the hinge p rts are and the balance of the edges of the halves meet moved relative each other, s d t0 asat d..- turn the shell halves to their original. or normal The slot. H acts as. atguide for: th -,Xpander 1', position-of'Fig: 1". atleast wingstmay engagethe edgesoi". the: shell 59 Since the yoke arms 16" are interlocked tfi the expander and they are also secured to the shell halves at their lower ends l4, and since the arms are not bendable in a rotationable direction of the shell and expander due to their rectangular section, the arms [6 will act to prevent relative rotation of the parts but should the interlock between the yoke and expander become released, then the wings 8 will engage the shell sections as stated before and prevent relative rotation of the shell and expander,

After drilling a hole in the mine roof suificient to take the shell I when the upper end is collapsed, the operator collapses the upper end of the shell and inserts the closed or upper end into the opening in the mine roof and then by pushing on the stud the expander is pressed against the bight ll of the yoke thereby shoving the shell and expander into position until the washer 20 engages the mine roof.

The operator then rotates the stud in the proper direction, usually clockwise, which starts the expander 1 moving into the shell (see Fig. 4), but friction or the interlock between the expander and shell does not effect relative rotation between the shell and wall of the drilled hole in the roof because of the pressure of the shell halves against the wall, and the expander having limited or no rotation relative to the shell, the expander cannot rotate with the rotation of the stud, hence the expander is drawn into the shell, expanding the same into secure engagement with the roof and at the same time the washer 2D is drawn tightly against the mine roof.

By assembling the parts so that the stud l engages the bight I1 and the washer 20 engages the mine roof, the shell I is held against a downward movement relative to the wall of the opening as the expander is drawn into the shell.

The arms l of the yoke are parallel in their assembled relation to the shell, therefore the expander slides freely with respect to the yoke.

If the expander is drawn into the shell a sufficient distance in effecting a grip upon the wall of the opening, then the lower end of the shell will yield permitting the shell sections to grip the wall their full length.

The yoke maintains the parts in their assembled relation prior to installation of the bolt. Having described and illustrated my invention .what I wish to protect is set forth in the following claims.

I claim-- 1. An expander anchor for a bolt comprising a shell formed of radially movable sections the upper ends of which are not connected with one another, a threaded expander adapted to be attached to the upper end of a threaded stud to move the expander longitudinally of the shell to force the sections into engagement with the wall of a prepared opening, yoke-shaped spring means having its open end down and secured to the lower ends of the shell sections and its bight bridging the sections at the upper end thereof, said spring means normally and yieldably holding the upper ends of the shell sections in a spread apart relation, whereby the normally spread-apart upper ends of the shell sections may be moved radially inwardly against the tension of the spring and thereby be made to enter the said opening and to engage the wall of the opening by tension of the spring and thereby preventing rotation of the shell relative to the said wall when the stud is rotated.

2. An expander anchor for a bolt comprising an expanded shell formed of a plurality of separate shell sections, the ends of the shell sections which are adapted to enter an opening first being referred to herein as the upper ends, and the opposite ends being the lower ends, spring means normally holding the lower ends of the shell sections yieldably together and the upper ends of the shell sections normally spread apart but movable radially inwardly to enter a drilled opening, a threaded movable expander at least a part of which is within the upper ends of the shell sections and is normally positioned to cooperate with a threaded stud when located between the shell sections whereby after said upper ends of the shell sections have been moved radially inwardly by manual means and then moved radially outwardly by said spring means into engagement with the wall of the drilled opening, the shell sections may be further spread apart by the expander when the stud is rotated and the expander is thereby drawn toward the lower end of the shell sections.

3. An expander anchor for a bolt comprising a shell formed of radially movable sections the upper ends of which are not connected with one another, a threaded expander adapted to be attached to the upper end of a threaded stud to move the expander longitudinally of the shell to force the sections into engagement with the wall of a prepared opening, yoke-shaped spring means with its side arms extending 1ongitudinally along the shell and its bight bridging the upper end of the shell and engageable by the expander to facilitate positioning the shell in the prepared opening, said spring means normally and yieldably holding the upper ends of the shell sections ina spread apart relation, whereby the normally spread-apart upper ends of the shell sections may be moved radially inwardly against the tension of the spring and thereby be made to enter the said opening and to engage the wall of the opening by tension of the spring and thereby preventing rotation of the shell relative to the said wall when the stud is rotated.

4. An expander anchor for a bolt comprising two separate shell sections each of which is relatively thick at its lower end and relatively thin at its upper end, the edges of the sections shaped so as to permit lower portions thereof to meet, a slot extending up the middle of each section above a lower portion thereof, a spring yoke with its arms located generally within the slots and the lower ends of the arms fastened to the lower portions of the respective shells below the slots, the yoke normally holding the lower ends of the shell sections with their edges substantially meeting and the upper ends of the sections normally spaced apart with the outside periphery thereof greater than the outside periphery of the lower ends with their edges meeting but with the upper ends compressible to an outside periphery not substantially greater than said outside periphery of the lower ends of the sections, the bight of the yoke positioned above the sections, and a longitudinally movable expander held within the space defined by the projecting portion of the yoke and the inner surfaces of the upper ends of the sections and engaged with the yoke so as to be non-rotatable relative to the sections and to expand the sections when the expander moves downwardly toward the lower ends of the shell sections.

5. An expander bolt which includes a stud with an expander threaded on its upper end, a hollow shell formed of two separate sections with the expander originally disposed adjacent the upper ends thereof, a separately formed yoke-shaped spring with its bight spaced longitudinally from the upper end of the shell and engageable by either an end of the expander or the upper end of the stud, a portion of the side arms of the yoke shaped spring being substantially coextensive with the shell sections, oppositely disposed means extending longitudinally along each shell section to receive the said coextensive portion of the side arms of the yolze-shaped spring, the upper ends of the shell sections being tapered thinner than the lower ends thereof, the lower end of each shell section encircling substantially one-half of the stud, each shell section being secured to one of the side arms of the spring yoke at the lower end of the shell thereby forcing the lower ends or" the sections inwardly toward the stud and simulta-- neously forcing the upper ends of the sections radially outward away from the stud so that the normal outer periphery of the upper end of the shell is greater than the normal outside periphery of its lower end, the upper ends of the shell sections being adapted to be moved inwardly toward the stud against the tension of the yoke-shaped spring to reduce the periphery of the shell sun ciently to enter a prepared opening for the bolt.

6-. In an expansion bolt comprising a threaded stud, a shell formed of a plurality of separately formed radially movable sections, a threaded expander in combination with the threaded upper end of the stud to move the expander longitudinally of the shell from the upper end toward the lower end to force the sections into engagement with the Wall of a prepared opening when the stud is rotated in one direction, the expander being tapered and the upper end of the shell sections being, thinner than at the lower end thereby forming a tapered inner surface engageable by the expander, the shell sections having op positely disposed longitudinal means associated with each shell section and extending substantially the entire length or" the shell, the combination with the shell of an elongated spring yoke, the arms of the yoke positioned in the said longitudinal means and having their free ends secured to the shell sections at the lower end of the shell, whereby the lower ends of the shell sections are normally held in yieldable pivotal relation and the upper ends of the shell sections are normally and yieldably held in spaced-apart relation, the arms of the spring yoke extending beyond the upper end of the shell with the bight at the closed end of the spring yoke adapted to be engaged by either the expander or the end of the stud to assist in the positioning of the bolt in the opening.

7. An expansion bolt which includes a stud with an expander threaded on its upper end, grooves in opposite sides of the expander in its outer surface, two shell sections, each slotted from its upper end to near its lower end, a spring yoke with its bight over the upper end of the stud and its sides located in the grooves and slidable longitudinally therein, inner portions of the sides of the spring yoke being located in the slots, the upper ends of the sheil sections being tapered thinner than the lower ends, the lower end of each shell section extending half way around the stud, each shell section being fastened to one side of the spring yoke with the lower end of the section adjacent the stud and its upper end away from the stud so that the outside periphery of the upper end of the shell is greater than the outside periphery of its lower end, the upper ends f the shell sections being adapted to be pressed toward the stud against the action of the spring yoke to make their outside periphery substantially the same a the outside periphery of their lower ends.

WARREN J. LEWIS.

References Cited in the file of this patent UNITED STATES PAENTS Number Name Date 406,565 Church July 9, 1889 674,074 Bennett May 14, 19-31 777,399 Church Dec. 13, 1994 841,338 Palmer Jan. 15, 1907 927,064 Mower July 6, 1909 1,139,712 Osborne May 18, 1915 1,153,797 Kegreiz Sept. 14, 1915 2,010,553 McIntosh Aug. 6, 1935 

